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;;;; gc.test --- test guile's garbage collection -*- scheme -*-
;;;; Copyright (C) 2000, 2001, 2004, 2006, 2007, 2008, 2009,
;;;; 2011, 2012, 2013 Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
(define-module (tests gc)
#:use-module (ice-9 documentation)
#:use-module (test-suite lib)
#:use-module ((system base compile) #:select (compile)))
;; Some of these tests verify that things are collectable. As we use a
;; third-party conservative collector, we really can't guarantee that --
;; we can try, but on some platforms, on some versions (possibly), the
;; test might fail. But we don't want that to stop the build. So,
;; instead of failing, throw 'unresolved.
;;
(define (maybe-gc-flakiness result)
(or result
(throw 'unresolved)))
;;;
;;; miscellaneous
;;;
(define (documented? object)
(not (not (object-documentation object))))
;; In guile 1.6.4 this test bombed, due to the record in h being collected
;; by the gc, but not removed from h, leaving "x" as a freed cell.
;; The usual correct result here is for x to be #f, but there's always a
;; chance gc will mark something used when it isn't, so we allow x to be a
;; record too.
(pass-if "weak-values versus records"
(let ((rec-type (make-record-type 'foo '()))
(h (make-weak-value-hash-table 61)))
(hash-set! h "foo" ((record-constructor rec-type)))
(gc)
(let ((x (hash-ref h "foo")))
(or (not x)
((record-predicate rec-type) x)))))
;;;
;;;
;;;
(with-test-prefix "gc"
(pass-if "after-gc-hook gets called"
(let* ((foo #f)
(thunk (lambda () (set! foo #t))))
(add-hook! after-gc-hook thunk)
(gc)
(remove-hook! after-gc-hook thunk)
foo))
(pass-if "Unused modules are removed"
(let* ((guard (make-guardian))
(total 1000))
(for-each (lambda (x) (guard (make-module))) (iota total))
;; Avoid false references to the modules on the stack.
(clear-stale-stack-references)
(gc)
(gc) ;; twice: have to kill the weak vectors.
(gc) ;; thrice: because the test doesn't succeed with only
;; one gc round. not sure why.
(maybe-gc-flakiness
(= (let lp ((i 0))
(if (guard)
(lp (1+ i))
i))
total))))
(pass-if "Lexical vars are collectable"
(let ((l (compile
'(begin
(define guardian (make-guardian))
(let ((f (list 'foo)))
(guardian f))
((@ (test-suite lib) clear-stale-stack-references))
(gc)(gc)(gc)
(guardian))
;; Prevent the optimizer from propagating f.
#:opts '(#:partial-eval? #f))))
(maybe-gc-flakiness (equal? l '(foo))))))
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